import axios from 'axios'
import { stringify } from './index'
import { Message } from 'element-ui'
import store from '@/store'
import { getToken } from '@/utils/auth'

const MESSAGE = {
  400: '请求错误',
  401: '未授权，请登录',
  403: '拒绝访问',
  404: '请求地址出错',
  408: '请求超时',
  500: '服务器内部错误',
  501: '服务未实现',
  502: '网关错误',
  503: '服务不可用',
  504: '网关超时',
  505: 'HTTP版本不受支持'
}

// create an axios instance
const service = axios.create({
  baseURL: process.env.VUE_APP_BASE_API, // url = base url + request url
  // withCredentials: true, // send cookies when cross-domain requests
  timeout: 20000, // request timeout
  headers: {
    'X-Requested-With': 'XMLHttpRequest',
    'Content-Type': 'application/x-www-form-urlencoded',
    'Version': '1.0.0'
  }
})

// request interceptor
service.interceptors.request.use(
  config => {
    // do something before request is sent
    config.transformRequest = [data => {
      return stringify(data)
    }]
    if (store.getters.token) {
      // let each request carry token
      // ['X-Token'] is a custom headers key
      // please modify it according to the actual situation
      config.headers['X-Token'] = getToken()
    }
    return config
  },
  error => {
    // do something with request error
    console.log(error) // for debug
    return Promise.reject(error)
  }
)

// response interceptor
service.interceptors.response.use(
  /**
   * If you want to get http information such as headers or status
   * Please return  response => response
   */

  /**
   * Determine the request status by custom code
   * Here is just an example
   * You can also judge the status by HTTP Status Code
   */
  response => {
    const res = response.data
    const code = res.ret
    const message = res.msg

    // if the custom code is not 20000, it is judged as an error.
    if (code !== 0) {
      Message({
        message: message || 'Error',
        type: 'error',
        duration: 5 * 1000
      })

      // 50008: Illegal token; 50012: Other clients logged in; 50014: Token expired;
      if (code === 2) {
        // to re-login
        store.dispatch('user/resetToken').then(() => {
          location.reload()
        })
      }
      return Promise.reject(new Error(message || 'Error'))
    } else {
      message && Message({
        message: message,
        type: 'success',
        duration: 5 * 1000
      })
      return res.data
    }
  },
  error => {
    if (error && error.response) {
      const status = error.response.status
      MESSAGE[status] && (error.message = MESSAGE[status])
    }
    Message({
      message: error.message,
      type: 'error',
      duration: 5 * 1000
    })
    return Promise.reject(error)
  }
)

export default service
